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通过对饱和含水冻土区埋地管道周围冻土层的温度场、水分场和应变应力场进行数值模拟分析,得出管道穿越冻土区应力、应变不均匀分布和变化的一般规律。由于管道的散热作用,周围冻土层的结构、成分遭到破坏,土壤孔隙水减少,蓄热量低于融土,同时伴随水分的传热和传质作用而带走热量使土壤更加干燥。这些变化影响土壤变形及应力状态:管道上方土壤应变、应力变化剧烈;管道周围应变渐增,应力不断减小,易产生融沉;管道下方非融冻土应变小于上方融土、呈层状递减,土壤被加固,应力不断增大。
Through the numerical simulation of the temperature field, the water field and the stress field in the permafrost zone around the buried pipeline in the saturated permafrost zone, the general laws of stress and strain distribution and variation in the pipeline passing through the permafrost zone are obtained. Due to the cooling effect of the pipeline, the structure and components of the surrounding frozen soil layer are destroyed, the pore water of the soil is reduced, the heat storage capacity is lower than that of the soil, and the heat is taken away with the heat and mass transfer of moisture to make the soil more dry. These changes affect the soil deformation and stress state: the soil above the pipe strain, dramatic changes in stress; pipe around the strain increases, the stress decreases, easy to produce sink and thaw; , Soil is reinforced, stress is increasing.